Gaya APA
duckson, D, W., kane, K, T, B, D.
(1999).
Exercises in physical geography
(
3)
.
Boston:
McGraw Hill.
Gaya MLA
duckson, Don, W.., kane, Kevin, T.;, Bruflodt,, Daryl.
"Exercises in physical geography".
3
Boston:
McGraw Hill,
1999.
Text.